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cc2520如何进入低功耗模式LPM2?

Other Parts Discussed in Thread: CC2520

我按照数据手册上的步骤
CC2520_SRFOFF();

CC2520_SXOSCOFF();
   CC2520_SRES();
  CC2520_VREG_EN_OPIN(0);
  CC2520_MEMWR8(CC2520_GPIOCTRL5, CC2520_GPIO_LOW);

可是用万用表看的话cc2520的功耗一直降不下来,有人遇见过这种情况吗?